48F +48R transmission mechanism

Abstract

The utility model belongs to the technical field of vehicle driving, and particularly discloses a 48F + 48R transmission mechanism. The reversing assembly is used for adjusting the advancing direction, the main speed change component is used for graded transmission, the auxiliary speed change assembly is used for adjusting the rotating speed, the common gear assembly is suitable for common conditions, the crawling gear assembly is used for crawling working conditions, and the central transmission assembly is used for transmission to a drive axle. The reversing assembly comprises an input shaft, a shuttle-type gear reversing idle wheel, a shuttle-type gear reversing driving gear and a shuttle-type gear reversing driven gear. The shuttle-type gear reversing driving gear is arranged on the input shaft; the main speed change part comprises a first-stage shaft and a second-stage shaft, and the central transmission assembly is in transmission connection with the second-stage shaft through a bevel gear set; the first-stage shaft and the second-stage shaft are provided with gears, synchronizers and mechanical shifting fork gear sleeves to achieve multi-stage speed change, 48 forward gears and 48 reverse gears are achieved, flexibility and adaptability are improved, the driving requirements under various complex working conditions are met, and the running efficiency and performance of a vehicle are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of vehicle driving, and in particular relates to a 48F+48R transmission mechanism. Background Art

[0002] At present, the gear arrangement of the transmission systems of various large and medium-power tractors produced domestically is generally 24F+8R, 24F+R24, 28F+28R, and at most 32F+32R. The speed arrangement cannot meet the user's operating needs very well, and there are shortcomings such as incomplete coverage of operating conditions and low operating efficiency. Utility Model Content

[0003] In order to solve the problems of the existing technology, a 48F+48R transmission mechanism is proposed. The utility model provides the following technical solutions:

[0004] A 48F+48R transmission mechanism, comprising, in sequence, a reversing assembly for adjusting the forward direction, a main transmission component for step-by-step transmission, an auxiliary transmission component for adjusting the speed, a normal gear component for normal operation, a crawler gear component for crawling operation, and a central transmission component for transmitting power to the drive axle;

[0005] The reversing assembly includes an input shaft and a shuttle gear reversing idler gear, a shuttle gear reversing driving gear and a shuttle gear reversing driven gear; the shuttle gear reversing driving gear is arranged on the input shaft; the main speed change component includes a primary shaft and a secondary shaft, and the central transmission assembly is connected to the secondary shaft through a bevel gear set; the primary shaft is coaxial with the transmission shaft, and the secondary shaft is parallel to the primary shaft; the primary shaft is provided with a main speed I gear driving gear, a main speed II gear driving gear, a main speed III gear driving gear, a main speed IV gear driving gear, a main speed V gear driving gear, and a main speed VI gear driving gear; the shuttle gear reversing driven gear is arranged at the end of the secondary shaft, and the secondary shaft is provided with a main speed I gear driven gear, a main speed II gear driven gear, a main speed III gear driven gear, a main speed IV gear driven gear, a main speed V gear driven gear, and a main speed VI gear driven gear corresponding to the primary shaft;

[0006] The auxiliary transmission assembly includes an auxiliary transmission A gear driving gear, an auxiliary transmission B gear driving gear, an auxiliary transmission C gear driving gear and an auxiliary transmission D gear driving gear arranged on the primary shaft, and an auxiliary transmission A gear driven gear, an auxiliary transmission B gear driven gear, an auxiliary transmission C gear driven gear and an auxiliary transmission D gear driven gear correspondingly arranged on the secondary shaft;

[0007] The normal gear assembly includes a normal gear driving gear arranged on the primary shaft and a normal gear driven gear correspondingly arranged on the secondary shaft;

[0008] The crawler gear assembly includes a crawler gear driving gear arranged on the primary shaft and a crawler gear driven gear correspondingly arranged on the secondary shaft;

[0009] Among them, a forward and reverse wet clutch is provided between the shuttle gear reversing driving gear and the speed gear I driven gear; a synchronizer is provided between the speed gear I driven gear and the main speed gear II driven gear, between the main speed gear III driven gear and the main speed gear IV driven gear, between the main speed gear V driving gear and the main speed gear VI driving gear, between the auxiliary speed gear A driven gear and the auxiliary speed gear B driven gear, between the auxiliary speed gear C driven gear and the auxiliary speed gear D driven gear, and between the ordinary gear driven gear and the creeper gear driven gear.

[0010] Preferably, the main speed gear II driving gear, the main speed gear I driving gear, the main speed gear IV driving gear, the main speed gear III driving gear, the main speed gear VI driving gear, and the main speed gear V driving gear on the primary shaft are arranged in sequence from the input end to the output end; the main speed gear II driven gear, the main speed gear I driven gear, the main speed gear IV driven gear, the main speed gear III driven gear, the main speed gear VI driven gear, and the main speed gear V driven gear on the secondary shaft are arranged in sequence from the input end to the output end.

[0011] Preferably, the central transmission assembly includes a rear axle drive shaft, a brake, a differential, a bevel gear set for connecting the rear axle drive shaft and the secondary shaft, and a planetary gear set for connecting the rear axle, and the brake and differential are arranged on the rear axle drive shaft.

[0012] Preferably, the bevel gear set includes a central transmission small bevel gear and a central transmission large bevel gear, the central transmission small bevel gear is connected to the secondary shaft, and the central transmission large bevel gear is connected to the rear axle drive shaft.

[0013] Preferably, the planetary gear set includes a final drive sun gear, a final drive planetary carrier, a final drive planetary gear and a final drive ring gear, the final drive sun gear is connected to the rear axle drive shaft, the final drive planetary carrier is connected to the rear axle, and the final drive planetary gear is installed on the final drive planetary carrier and meshes with the final drive sun gear.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. By arranging the reversing assembly, main transmission components, auxiliary transmission components, normal gear components, crawler gear components and central transmission components, a 48-speed front and 48-speed reverse shift function is achieved, which broadens the speed range, improves the flexibility and adaptability of the transmission system, and can meet the driving needs under various complex working conditions;

[0016] 2. The forward and reverse wet clutch and synchronizer ensure the smoothness and reliability of the gear shifting process, and improve the stability and safety of the transmission system;

[0017] 3. Different power take-off outputs can be selected according to needs through the power take-off assembly, which improves the versatility of the transmission system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the transmission structure of the utility model;

[0019] In the attached figure, 1, shuttle gear reversing driving gear; 2, main speed gear II driving gear; 3, shuttle gear reversing idler gear; 4, shuttle gear reversing driven gear; 5, main speed gear II driven gear; 6, main speed gear I driving gear; 7, main speed gear IV driving gear; 8, main speed gear III driving gear; 9, main speed gear VI driving gear; 10, main speed gear V driving gear; 11, main speed gear I driven gear; 12, main speed gear IV driven gear Gears; 13. Main speed gear III driven gear; 14. Main speed gear VI driven gear; 15. Main speed gear V driven gear; 16. Auxiliary speed gear D driven gear; 17. Auxiliary speed gear D driving gear; 18. Auxiliary speed gear C driving gear; 19. Auxiliary speed gear B driving gear; 20. Auxiliary speed gear A driving gear; 21. Auxiliary speed gear C driven gear; 22. Auxiliary speed gear B driven gear; 23. Auxiliary speed gear A driven gear; 24. Normal gear driven gear; 25. Normal gear driving gear; 26. Creeper gear driving gear; 27. Creeper gear driven gear; 28. Central drive small bevel gear; 29. ​​Central drive large bevel gear; 30. Final drive sun gear; 31. Final drive planetary gear; 32. Final drive ring gear; 33. PTO driving gear I; 34. PTO driving gear II; 35. PT0 driven gear I; 36. PT0 driven gear II; 37. Final drive planetary carrier; 38. Forward and reverse wet clutch; 39. Differential lock clutch; 40. Power take-off wet clutch; 41. Input shaft; 42. Primary shaft; 43. Secondary shaft; 44. Rear axle drive shaft; 45. Synchronizer; 46. Differential; 47. Brake; 48. Mechanical shift fork sleeve I; 49. Mechanical shift fork sleeve II; 50. Mechanical shift fork sleeve III; 51. Mechanical shift fork sleeve VI. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is clearly and completely described below in conjunction with the accompanying drawings of the present invention. The directional words mentioned in the following embodiments, such as "up", "down", "left" and "right", etc., are only used with reference to the directions of the accompanying drawings. Therefore, the directional words used are used to illustrate rather than limit the invention of the present invention.

[0021] Glossary:

[0022] PTO: Power Take Off (PTO).

[0023] like Figure 1 As shown, a 48F+48R transmission mechanism includes, in sequence, a reversing assembly for adjusting the forward direction, a main transmission component for step-by-step transmission, an auxiliary transmission component for adjusting the speed, a normal gear component for normal conditions, a crawler gear component for crawling conditions, and a central transmission component for transmitting power to the drive axle;

[0024] The reversing assembly includes an input shaft 41 and a shuttle gear reversing idler 3, a shuttle gear reversing driving gear 1 and a shuttle gear reversing driven gear 4; the shuttle gear reversing driving gear 1 is arranged on the input shaft 41; the main speed change component includes a primary shaft 42 and a secondary shaft 43, and the central transmission assembly is connected to the secondary shaft 43 through a bevel gear set; the primary shaft 42 is coaxial with the transmission shaft, and the secondary shaft 43 is parallel to the primary shaft 42; the primary shaft 42 is provided with a main speed I gear driving gear 6 and a main speed II gear driving gear 2. Main speed gear III driving gear 8, main speed gear IV driving gear 7, main speed gear V driving gear 10, and main speed gear VI driving gear 9; the shuttle gear reversing driven gear 4 is disposed at the end of a secondary shaft 43, and on the secondary shaft 43 corresponding to the primary shaft 42 are disposed a main speed gear I driven gear 11, a main speed gear II driven gear 5, a main speed gear III driven gear 13, a main speed gear IV driven gear 12, a main speed gear V driven gear 15, and a main speed gear VI driven gear 14. Through different gear combinations, a multi-speed shifting function is achieved;

[0025] The auxiliary transmission assembly includes an auxiliary transmission A gear driving gear 20, an auxiliary transmission B gear driving gear 19, an auxiliary transmission C gear driving gear 18, and an auxiliary transmission D gear driving gear 17 arranged on the primary shaft 42, and an auxiliary transmission A gear driven gear 23, an auxiliary transmission B gear driven gear 22, an auxiliary transmission C gear driven gear 21, and an auxiliary transmission D gear driven gear 16 correspondingly arranged on the secondary shaft 43, further widening the speed range and improving the flexibility of the transmission system;

[0026] The normal gear assembly includes a normal gear driving gear 25 provided on the primary shaft 42 and a corresponding normal gear driven gear 24 provided on the secondary shaft 43, which is suitable for normal driving conditions and ensures the normal operation of the vehicle;

[0027] The crawler gear assembly includes a crawler gear driving gear 26 provided on the primary shaft 42 and a crawler gear driven gear 27 correspondingly provided on the secondary shaft 43, and is suitable for low-speed and high-torque crawling conditions, thereby improving the vehicle's passability.

[0028] Among them, a forward and reverse wet clutch 38 is provided between the shuttle gear reversing driving gear 1 and the speed gear I driven gear; a synchronizer 45 is provided between the speed gear I driven gear and the main speed gear II driven gear 5, between the main speed gear III driven gear 13 and the main speed gear IV driven gear 12, between the main speed gear V driving gear 10 and the main speed gear VI driving gear 9, between the auxiliary speed gear A driven gear 23 and the auxiliary speed gear B driven gear 22, between the auxiliary speed gear C driven gear 21 and the auxiliary speed gear D driven gear 16, and between the normal gear driven gear 24 and the creeper gear driven gear 27, ensuring the smoothness and reliability of the gear shifting process.

[0029] Specifically, on the primary shaft 42, the main speed II gear driving gear 2, the main speed I gear driving gear 6, the main speed IV gear driving gear 7, the main speed III gear driving gear 8, the main speed VI gear driving gear 9, and the main speed V gear driving gear 10 are arranged in sequence from the input end to the output end; on the secondary shaft 43, the main speed II gear driven gear 5, the main speed I gear driven gear 11, the main speed IV gear driven gear 12, the main speed III gear driven gear 13, the main speed VI gear driven gear 14, and the main speed V gear driven gear 15 are arranged in sequence from the input end to the output end. The structural layout is reasonable and easy to maintain.

[0030] Specifically, the central transmission assembly includes a rear axle drive shaft 44, a brake 47, a differential 46, a bevel gear set for connecting the rear axle drive shaft 44 and the secondary shaft 43, and a planetary gear set for connecting the rear axle. The brake 47 and the differential 46 are arranged on the rear axle drive shaft 44, and the differential 46 is provided with a differential lock clutch 39, which improves the driving stability and safety of the vehicle.

[0031] Specifically, the bevel gear set includes a central transmission small bevel gear 28 and a central transmission large bevel gear 29. The central transmission small bevel gear 28 is connected to the secondary shaft 43, and the central transmission large bevel gear 29 is connected to the rear axle transmission shaft 44 to effectively transmit and convert power.

[0032] Specifically, the planetary gear set includes a final drive sun gear 30, a final drive planetary carrier 37, a final drive planetary gear 31 and a final drive ring gear 32. The final drive sun gear 30 is connected to the rear axle drive shaft 44, the final drive planetary carrier 37 is connected to the rear axle, and the final drive planetary gear 31 is installed on the final drive planetary carrier 37 and engages with the final drive sun gear 30.

[0033] Furthermore, it also includes a power take-off assembly, which includes a primary power take-off shaft and a power output wet clutch 40 for connecting to the primary shaft 42, which can conveniently realize power output and conversion.

[0034] Furthermore, the power take-off assembly also includes a secondary power take-off shaft, on which a PTO driving gear I33 and a PTO driving gear II34 are provided, and on which a PT0 driven gear I35 and a PT0 driven gear II36 are correspondingly provided. A synchronizer 45 is provided between the PT0 driven gear I35 and the PT0 driven gear II36, and the engagement or disengagement with the PT0 driven gear I35 or the PT0 driven gear II36 is controlled by a mechanical shift fork gear sleeve VI 51. Different power take-off outputs can be selected according to needs, thereby improving the versatility of the transmission system.

[0035] It has achieved 48 forward gears and 48 reverse gears, significantly improving the flexibility and adaptability of the transmission system, being able to meet driving needs under various complex working conditions, and improving the vehicle's operating efficiency and performance.

[0036] Specifically, the gears include:

[0037] Forward gear / direct gear:

[0038] Forward gear A1: Operate the shift mechanism to engage the synchronizer 45 with the main speed gear I driven gear 11, disengage the mechanical shift fork gear sleeve I 48, engage the mechanical shift fork gear sleeve II 49 with the auxiliary speed gear A driven gear 23, and engage the mechanical shift fork gear sleeve III 50 with the secondary shaft 43. The transmission route at this time is: main speed gear I driving gear 6 → main speed gear I driven gear 11 → auxiliary speed gear D driven gear 16 → auxiliary speed gear D driving gear 17 → auxiliary speed gear A driving gear 20 → auxiliary speed gear A driven gear 23 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0039] Forward gear A2: Operate the shift mechanism to engage the synchronizer 45 with the main speed II gear driven gear 5, disengage the mechanical shift fork gear sleeve I 48, engage the mechanical shift fork gear sleeve II 49 with the auxiliary speed A gear driven gear 23, and engage the mechanical shift fork gear sleeve III 50 with the secondary shaft 43. The transmission route at this time is: main speed II gear driving gear 2 → main speed II gear driven gear 5 → auxiliary speed D gear driven gear 16 → auxiliary speed D gear driving gear 17 → auxiliary speed A gear driving gear 20 → auxiliary speed A gear driven gear 23 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0040] Forward gear A3: Operate the shift mechanism to engage the synchronizer 45 with the main speed gear III driven gear 13, disengage the mechanical shift fork gear sleeve I 48, engage the mechanical shift fork gear sleeve II 49 with the auxiliary speed gear A driven gear 23, and engage the mechanical shift fork gear sleeve III 50 with the secondary shaft 43. The transmission route at this time is: main speed gear III driving gear 8 → main speed gear III driven gear 13 → auxiliary speed gear D driven gear 16 → auxiliary speed gear D driving gear 17 → auxiliary speed gear A driving gear 20 → auxiliary speed gear A driven gear 23 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0041] Forward gear A4: Operate the shift mechanism to engage the synchronizer 45 with the main speed gear IV driven gear 12, disengage the mechanical shift fork gear sleeve I 48, engage the mechanical shift fork gear sleeve II 49 with the auxiliary speed gear A driven gear 23, and engage the mechanical shift fork gear sleeve III 50 with the secondary shaft 43. The transmission route at this time is: main speed gear IV driving gear 7 → main speed gear IV driven gear 12 → auxiliary speed gear D driven gear 16 → auxiliary speed gear D driving gear 17 → auxiliary speed gear A driving gear 20 → auxiliary speed gear A driven gear 23 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0042] Forward gear A5: Operate the shift mechanism to engage the synchronizer 45 with the main speed V gear driving gear 10, disengage the mechanical shift fork gear sleeve I 48, engage the mechanical shift fork gear sleeve II 49 with the auxiliary speed A gear driven gear 23, and engage the mechanical shift fork gear sleeve III 50 with the secondary shaft 43. The transmission route at this time is: main speed V gear driving gear 10 → main speed V gear driven gear 15 → auxiliary speed D gear driven gear 16 → auxiliary speed D gear driving gear 17 → auxiliary speed A gear driving gear 20 → auxiliary speed A gear driven gear 23 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0043] Forward gear A6: Operate the shift mechanism to engage the synchronizer 45 with the main speed VI gear driving gear 9, disengage the mechanical shift fork gear sleeve I 48, engage the mechanical shift fork gear sleeve II 49 with the auxiliary speed A gear driven gear 23, and engage the mechanical shift fork gear sleeve III 50 with the secondary shaft 43. The transmission route at this time is: main speed VI gear driving gear 9 → main speed VI gear driven gear 14 → auxiliary speed D gear driven gear 16 → auxiliary speed D gear driving gear 17 → auxiliary speed A gear driving gear 20 → auxiliary speed A gear driven gear 23 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0044] Forward gear B1: Operate the shift mechanism to engage the synchronizer 45 with the main speed I gear driven gear 11, disengage the mechanical shift fork gear sleeve I 48, engage the mechanical shift fork gear sleeve II 49 with the auxiliary speed B gear driven gear 22, and engage the mechanical shift fork gear sleeve III 50 with the secondary shaft 43. The transmission route at this time is: main speed I gear driving gear 6 → main speed I gear driven gear 11 → auxiliary speed D gear driven gear 16 → auxiliary speed D gear driving gear 17 → auxiliary speed B gear driving gear 19 → auxiliary speed B gear driven gear 22 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0045] Forward gear B2: Operate the shift mechanism to engage the synchronizer 45 with the main speed II gear driven gear 5, disengage the mechanical shift fork gear sleeve I 48, engage the mechanical shift fork gear sleeve II 49 with the auxiliary speed B gear driven gear 22, and engage the mechanical shift fork gear sleeve III 50 with the secondary shaft 43. The transmission route at this time is: main speed II gear driving gear 2 → main speed II gear driven gear 5 → auxiliary speed D gear driven gear 16 → auxiliary speed D gear driving gear 17 → auxiliary speed B gear driving gear 19 → auxiliary speed B gear driven gear 22 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0046] Forward gear B3: Operate the shift mechanism to engage the synchronizer 45 with the main speed gear III driven gear 13, disengage the mechanical shift fork gear sleeve I 48, engage the mechanical shift fork gear sleeve II 49 with the auxiliary speed gear B driven gear 22, and engage the mechanical shift fork gear sleeve III 50 with the secondary shaft 43. The transmission route at this time is: main speed gear III driving gear 8 → main speed gear III driven gear 13 → auxiliary speed gear D driven gear 16 → auxiliary speed gear D driving gear 17 → auxiliary speed gear B driving gear 19 → auxiliary speed gear B driven gear 22 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0047] Forward gear B4: Operate the shift mechanism to engage the synchronizer 45 with the main speed gear IV driven gear 12, disengage the mechanical shift fork gear sleeve I 48, engage the mechanical shift fork gear sleeve II 49 with the auxiliary speed gear B driven gear 22, and engage the mechanical shift fork gear sleeve III 50 with the secondary shaft 43. The transmission route at this time is: main speed gear IV driving gear 7 → main speed gear IV driven gear 12 → auxiliary speed gear D driven gear 16 → auxiliary speed gear D driving gear 17 → auxiliary speed gear B driving gear 19 → auxiliary speed gear B driven gear 22 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0048] Forward gear B5: Operate the shift mechanism to engage the synchronizer 45 with the main speed V gear driving gear 10, disengage the mechanical shift fork gear sleeve I 48, engage the mechanical shift fork gear sleeve II 49 with the auxiliary speed B gear driven gear 22, and engage the mechanical shift fork gear sleeve III 50 with the secondary shaft 43. The transmission route at this time is: main speed V gear driving gear 10 → main speed V gear driven gear 15 → auxiliary speed D gear driven gear 16 → auxiliary speed D gear driving gear 17 → auxiliary speed B gear driving gear 19 → auxiliary speed B gear driven gear 22 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0049] Forward gear B6: Operate the shift mechanism to engage the synchronizer 45 with the main speed VI gear driving gear 9, disengage the mechanical shift fork gear sleeve I 48, engage the mechanical shift fork gear sleeve II 49 with the auxiliary speed B gear driven gear 22, and engage the mechanical shift fork gear sleeve III 50 with the secondary shaft 43. The transmission route at this time is: main speed VI gear driving gear 9 → main speed VI gear driven gear 14 → auxiliary speed D gear driven gear 16 → auxiliary speed D gear driving gear 17 → auxiliary speed B gear driving gear 19 → auxiliary speed B gear driven gear 22 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0050] Forward gear C1: Operate the shift mechanism to engage the synchronizer 45 with the main speed I gear driven gear 11, the mechanical shift fork gear sleeve I 48 with the auxiliary speed C gear driven gear 21, and the mechanical shift fork gear sleeve III 50 with the secondary shaft 43. The transmission route at this time is: main speed I gear driving gear 6 → main speed I gear driven gear 11 → auxiliary speed D gear driven gear 16 → auxiliary speed D gear driving gear 17 → auxiliary speed C gear driving gear 18 → auxiliary speed C gear driven gear 21 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0051] Forward gear C2: Operate the shift mechanism to engage the synchronizer 45 with the main speed II gear driven gear 5, the mechanical shift fork gear sleeve I 48 with the auxiliary speed C gear driven gear 21, and the mechanical shift fork gear sleeve III 50 with the secondary shaft 43. The transmission route at this time is: main speed II gear driving gear 2 → main speed II gear driven gear 5 → auxiliary speed D gear driven gear 16 → auxiliary speed D gear driving gear 17 → auxiliary speed C gear driving gear 18 → auxiliary speed C gear driven gear 21 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0052] Forward gear C3: Operate the shift mechanism to engage the synchronizer 45 with the main speed gear III driven gear 13, the mechanical shift fork gear sleeve I 48 with the auxiliary speed gear C driven gear 21, and the mechanical shift fork gear sleeve III 50 with the secondary shaft 43. The transmission route at this time is: main speed gear III driving gear 8 → main speed gear III driven gear 13 → auxiliary speed gear D driven gear 16 → auxiliary speed gear D driving gear 17 → auxiliary speed gear C driving gear 18 → auxiliary speed gear C driven gear 21 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0053] Forward gear C4: Operate the shift mechanism to engage the synchronizer 45 with the main speed gear IV driven gear 12, the mechanical shift fork gear sleeve I 48 with the auxiliary speed gear C driven gear 21, and the mechanical shift fork gear sleeve III 50 with the secondary shaft 43. The transmission route at this time is: main speed gear IV driving gear 7 → main speed gear IV driven gear 12 → main speed gear I driving gear 6 → auxiliary speed gear D driving gear 17 → auxiliary speed gear C driving gear 18 → auxiliary speed gear C driven gear 21 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0054] Forward gear C5: Operate the shift mechanism to engage the synchronizer 45 with the main speed V gear driving gear 10, the mechanical shift fork gear sleeve I 48 with the auxiliary speed C gear driven gear 21, and the mechanical shift fork gear sleeve III 50 with the secondary shaft 43. The transmission route at this time is: main speed V gear driving gear 10 → main speed V gear driven gear 15 → auxiliary speed D gear driven gear 16 → auxiliary speed D gear driving gear 17 → auxiliary speed C gear driving gear 18 → auxiliary speed C gear driven gear 21 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0055] Forward gear C6: Operate the shift mechanism to engage the synchronizer 45 with the main speed VI gear driving gear 9, the mechanical shift fork gear sleeve I 48 with the auxiliary speed C gear driven gear 21, and the mechanical shift fork gear sleeve III 50 with the secondary shaft 43. The transmission route at this time is: main speed VI gear driving gear 9 → main speed VI gear driven gear 14 → auxiliary speed D gear driven gear 16 → auxiliary speed D gear driving gear 17 → auxiliary speed C gear driving gear 18 → auxiliary speed C gear driven gear 21 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0056] Forward gear D1: Operate the shift mechanism to engage the synchronizer 45 with the main transmission gear I driven gear 11, and the mechanical shift fork gear sleeve III 50 with the secondary shaft 43. The transmission route at this time is: main transmission gear I driving gear 6 → main transmission gear I driven gear 11 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0057] Forward gear D2: Operate the shift mechanism to engage the synchronizer 45 with the main transmission II gear driven gear 5, and the mechanical shift fork gear sleeve III 50 with the secondary shaft 43. The transmission route at this time is: main transmission II gear driving gear 2 → main transmission II gear driven gear 5 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0058] Forward gear D3: Operate the shift mechanism to engage the synchronizer 45 with the main speed gear III driven gear 13, and the mechanical shift fork gear sleeve III 50 with the secondary shaft 43. The transmission route at this time is: main speed gear III driving gear 8 → main speed gear III driven gear 13 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0059] Forward gear D4: Operate the shift mechanism to engage the synchronizer 45 with the main transmission gear IV driven gear 12, and the mechanical shift fork sleeve III 50 with the secondary shaft 43. The transmission route at this time is: main transmission gear IV driving gear 7 → main transmission gear IV driven gear 12 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0060] Forward gear D5: Operate the shift mechanism to engage the synchronizer 45 with the main speed V gear driving gear 10, and the mechanical shift fork gear sleeve III 50 with the secondary shaft 43. The transmission route at this time is: main speed V gear driving gear 10 → main speed V gear driven gear 15 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0061] Forward gear D6: Operate the shift mechanism to engage the synchronizer 45 with the main transmission VI gear driving gear 9, and the mechanical shift fork gear sleeve III 50 with the secondary shaft 43. The transmission route at this time is: main transmission VI gear driving gear 9 → main transmission VI gear driven gear 14 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0062] 2. Forward gear / crawler gear:

[0063] Forward gear A1: Operate the shift mechanism to engage the synchronizer 45 with the main speed gear I driven gear 11, disengage the mechanical shift fork gear sleeve I 48, engage the mechanical shift fork gear sleeve II 49 with the auxiliary speed gear A driven gear 23, engage the normal gear driven gear 24 with the normal gear driving gear 25, and engage the mechanical shift fork gear sleeve III 50 with the crawler gear driven gear 27. The transmission route at this time is: main speed gear I driving gear 6 → main speed gear I driven gear 11 → auxiliary speed gear D driven gear 16 → auxiliary speed gear D driving gear 17 → auxiliary speed gear A driving gear 20 → auxiliary speed gear A driven gear 23 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0064] Forward gear A2: Operate the shift mechanism to engage the synchronizer 45 with the main speed gear II driven gear 5, disengage the mechanical shift fork gear sleeve I 48, engage the mechanical shift fork gear sleeve II 49 with the auxiliary speed gear A driven gear 23, engage the normal gear driven gear 24 with the normal gear driving gear 25, and engage the mechanical shift fork gear sleeve III 50 with the crawler gear driven gear 27. The transmission route at this time is: main speed gear II driving gear 2 → main speed gear II driven gear 5 → auxiliary speed gear D driven gear 16 → auxiliary speed gear D driving gear 17 → auxiliary speed gear A driving gear 20 → auxiliary speed gear A driven gear 23 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0065] Forward gear A3: Operate the shift mechanism to engage the synchronizer 45 with the main speed gear I driven gear 11, disengage the mechanical shift fork gear sleeve I 48, engage the mechanical shift fork gear sleeve II 49 with the main speed gear III driven gear 13, engage the normal gear driven gear 24 with the normal gear driving gear 25, and engage the mechanical shift fork gear sleeve III 50 with the crawler gear driven gear 27. The transmission route at this time is: main speed gear III driving gear 8 → main speed gear III driven gear 13 → auxiliary speed gear D driven gear 16 → auxiliary speed gear D driving gear 17 → auxiliary speed gear A driving gear 20 → auxiliary speed gear A driven gear 23 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0066] Forward gear A4: Operate the shift mechanism to engage the synchronizer 45 with the main speed gear IV driven gear 12, disengage the mechanical shift fork gear sleeve I 48, engage the mechanical shift fork gear sleeve II 49 with the auxiliary speed gear A driven gear 23, engage the normal gear driven gear 24 with the normal gear driving gear 25, and engage the mechanical shift fork gear sleeve III 50 with the crawler gear driven gear 27. The transmission route at this time is: main speed gear IV driving gear 7 → main speed gear IV driven gear 12 → auxiliary speed gear D driven gear 16 → auxiliary speed gear D driving gear 17 → auxiliary speed gear A driving gear 20 → auxiliary speed gear A driven gear 23 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0067] Forward gear A5: Operate the shift mechanism to engage the synchronizer 45 with the main speed V gear driving gear 10, disengage the mechanical shift fork gear sleeve I 48, engage the mechanical shift fork gear sleeve II 49 with the auxiliary speed A gear driven gear 23, engage the normal gear driven gear 24 with the normal gear driving gear 25, and engage the mechanical shift fork gear sleeve III 50 with the crawler gear driven gear 27. The transmission route at this time is: main speed V gear driving gear 10 → main speed V gear driven gear 15 → auxiliary speed D gear driven gear 16 → auxiliary speed D gear driving gear 17 → auxiliary speed A gear driving gear 20 → auxiliary speed A gear driven gear 23 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0068] Forward gear A6: Operate the shift mechanism to engage the synchronizer 45 with the main speed VI gear driving gear 9, disengage the mechanical shift fork gear sleeve I 48, engage the mechanical shift fork gear sleeve II 49 with the auxiliary speed A gear driven gear 23, engage the normal gear driven gear 24 with the normal gear driving gear 25, and engage the mechanical shift fork gear sleeve III 50 with the crawler gear driven gear 27. The transmission route at this time is: main speed VI gear driving gear 9 → main speed VI gear driven gear 14 → auxiliary speed D gear driven gear 16 → auxiliary speed D gear driving gear 17 → auxiliary speed A gear driving gear 20 → auxiliary speed A gear driven gear 23 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0069] Forward gear B1: Operate the shift mechanism to engage the synchronizer 45 with the main speed gear I driven gear 11, disengage the mechanical shift fork gear sleeve I 48, engage the mechanical shift fork gear sleeve II 49 with the auxiliary speed gear B driven gear 22, engage the normal gear driven gear 24 with the normal gear driving gear 25, and engage the mechanical shift fork gear sleeve III 50 with the crawler gear driven gear 27. The transmission route at this time is: main speed gear I driving gear 6 → main speed gear I driven gear 11 → auxiliary speed gear D driven gear 16 → auxiliary speed gear D driving gear 17 → auxiliary speed gear B driving gear 19 → auxiliary speed gear B driven gear 22 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0070] Forward gear B2: Operate the shift mechanism to engage the synchronizer 45 with the main speed II gear driven gear 5, disengage the mechanical shift fork gear sleeve I 48, engage the mechanical shift fork gear sleeve II 49 with the auxiliary speed B gear driven gear 22, engage the normal gear driven gear 24 with the normal gear driving gear 25, and engage the mechanical shift fork gear sleeve III 50 with the crawler gear driven gear 27. The transmission route at this time is: main speed II gear driving gear 2 → main speed II gear driven gear 5 → auxiliary speed D gear driven gear 16 → auxiliary speed D gear driving gear 17 → auxiliary speed B gear driving gear 19 → auxiliary speed B gear driven gear 22 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0071] Forward gear B3: Operate the shift mechanism to engage the synchronizer 45 with the main speed gear III driven gear 13, disengage the mechanical shift fork gear sleeve I 48, engage the mechanical shift fork gear sleeve II 49 with the auxiliary speed gear B driven gear 22, engage the normal gear driven gear 24 with the normal gear driving gear 25, and engage the mechanical shift fork gear sleeve III 50 with the crawler gear driven gear 27. The transmission route at this time is: main speed gear III driving gear 8 → main speed gear III driven gear 13 → auxiliary speed gear D driven gear 16 → auxiliary speed gear D driving gear 17 → auxiliary speed gear B driving gear 19 → auxiliary speed gear B driven gear 22 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0072] Forward gear B4: Operate the shift mechanism to engage the synchronizer 45 with the main speed gear IV driven gear 12, disengage the mechanical shift fork gear sleeve I 48, engage the mechanical shift fork gear sleeve II 49 with the auxiliary speed gear B driven gear 22, engage the normal gear driven gear 24 with the normal gear driving gear 25, and engage the mechanical shift fork gear sleeve III 50 with the crawler gear driven gear 27. The transmission route at this time is: main speed gear IV driving gear 7 → main speed gear IV driven gear 12 → auxiliary speed gear D driven gear 16 → auxiliary speed gear D driving gear 17 → auxiliary speed gear B driving gear 19 → auxiliary speed gear B driven gear 22 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0073] Forward gear B5: Operate the shift mechanism to engage the synchronizer 45 with the main speed V gear driving gear 10, disengage the mechanical shift fork gear sleeve I 48, engage the mechanical shift fork gear sleeve II 49 with the auxiliary speed B gear driven gear 22, engage the normal gear driven gear 24 with the normal gear driving gear 25, and engage the mechanical shift fork gear sleeve III 50 with the crawler gear driven gear 27. The transmission route at this time is: main speed V gear driving gear 10 → main speed V gear driven gear 15 → auxiliary speed D gear driven gear 16 → auxiliary speed D gear driving gear 17 → auxiliary speed B gear driving gear 19 → auxiliary speed B gear driven gear 22 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0074] Forward gear B6: Operate the shift mechanism to engage the synchronizer 45 with the main speed VI gear driving gear 9, disengage the mechanical shift fork gear sleeve I 48, engage the mechanical shift fork gear sleeve II 49 with the auxiliary speed B gear driven gear 22, engage the normal gear driven gear 24 with the normal gear driving gear 25, and engage the mechanical shift fork gear sleeve III 50 with the crawler gear driven gear 27. The transmission route at this time is: main speed VI gear driving gear 9 → main speed VI gear driven gear 14 → auxiliary speed D gear driven gear 16 → auxiliary speed D gear driving gear 17 → auxiliary speed B gear driving gear 19 → auxiliary speed B gear driven gear 22 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0075] Forward gear C1: Operate the shift mechanism to engage the synchronizer 45 with the main speed I gear driven gear 11, disengage the mechanical shift fork gear sleeve I 48, engage the mechanical shift fork gear sleeve I 48 with the auxiliary speed C gear driven gear 21, engage the normal gear driven gear 24 with the normal gear driving gear 25, and engage the mechanical shift fork gear sleeve III 50 with the crawler gear driven gear 27. The transmission route at this time is: main speed I gear driving gear 6 → main speed I gear driven gear 11 → auxiliary speed D gear driven gear 16 → auxiliary speed D gear driving gear 17 → auxiliary speed C gear driving gear 18 → auxiliary speed C gear driven gear 21 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0076] Forward gear C2: Operate the shift mechanism to engage the synchronizer 45 with the main speed II gear driven gear 5, disengage the mechanical shift fork gear sleeve I 48, engage the mechanical shift fork gear sleeve I 48 with the auxiliary speed C gear driven gear 21, engage the normal gear driven gear 24 with the normal gear driving gear 25, and engage the mechanical shift fork gear sleeve III 50 with the crawler gear driven gear 27. The transmission route at this time is: main speed II gear driving gear 2 → main speed II gear driven gear 5 → auxiliary speed D gear driven gear 16 → auxiliary speed D gear driving gear 17 → auxiliary speed C gear driving gear 18 → auxiliary speed C gear driven gear 21 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0077] Forward gear C3: Operate the shift mechanism to engage the synchronizer 45 with the main speed gear III driven gear 13, disengage the mechanical shift fork gear sleeve I 48, engage the mechanical shift fork gear sleeve I 48 with the auxiliary speed gear C driven gear 21, engage the normal gear driven gear 24 with the normal gear driving gear 25, and engage the mechanical shift fork gear sleeve III 50 with the crawler gear driven gear 27. The transmission route at this time is: main speed gear III driving gear 8 → main speed gear III driven gear 13 → auxiliary speed gear D driven gear 16 → auxiliary speed gear D driving gear 17 → auxiliary speed gear C driving gear 18 → auxiliary speed gear C driven gear 21 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0078] Forward gear C4: Operate the shift mechanism to engage the synchronizer 45 with the main speed gear IV driven gear 12, disengage the mechanical shift fork gear sleeve I 48, engage the mechanical shift fork gear sleeve I 48 with the auxiliary speed gear C driven gear 21, engage the normal gear driven gear 24 with the normal gear driving gear 25, and engage the mechanical shift fork gear sleeve III 50 with the crawler gear driven gear 27. The transmission route at this time is: main speed gear IV driving gear 7 → main speed gear IV driven gear 12 → auxiliary speed gear D driven gear 16 → auxiliary speed gear D driving gear 17 → auxiliary speed gear C driving gear 18 → auxiliary speed gear C driven gear 21 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0079] Forward gear C5: Operate the shift mechanism to engage the synchronizer 45 with the main speed V gear driving gear 10, disengage the mechanical shift fork gear sleeve I 48, engage the mechanical shift fork gear sleeve I 48 with the auxiliary speed C gear driven gear 21, engage the normal gear driven gear 24 with the normal gear driving gear 25, and engage the mechanical shift fork gear sleeve III 50 with the crawler gear driven gear 27. The transmission route at this time is: main speed V gear driving gear 10 → main speed V gear driven gear 15 → auxiliary speed D gear driven gear 16 → auxiliary speed D gear driving gear 17 → auxiliary speed C gear driving gear 18 → auxiliary speed C gear driven gear 21 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0080] Forward gear C6: Operate the shift mechanism to engage the synchronizer 45 with the main speed VI gear driving gear 9, disengage the mechanical shift fork gear sleeve I 48, engage the mechanical shift fork gear sleeve I 48 with the auxiliary speed C gear driven gear 21, engage the normal gear driven gear 24 with the normal gear driving gear 25, and engage the mechanical shift fork gear sleeve III 50 with the crawler gear driven gear 27. The transmission route at this time is: main speed VI gear driving gear 9 → main speed VI gear driven gear 14 → auxiliary speed D gear driven gear 16 → auxiliary speed D gear driving gear 17 → auxiliary speed C gear driving gear 18 → auxiliary speed C gear driven gear 21 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0081] Forward gear D1: Operate the shift mechanism to engage the synchronizer 45 with the main speed gear I driven gear 11, the mechanical shift fork gear sleeve I 48 with the secondary shaft 43, the normal gear driven gear 24 with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 50 with the crawler gear driven gear 27. The transmission route at this time is: main speed gear I driving gear 6 → main speed gear I driven gear 11 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0082] Forward gear D2: Operate the shift mechanism to engage the synchronizer 45 with the main speed gear II driven gear 5, the mechanical shift fork gear sleeve I 48 with the secondary shaft 43, the normal gear driven gear 24 with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 50 with the crawler gear driven gear 27. The transmission route at this time is: main speed gear II driving gear 2 → main speed gear II driven gear 5 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final drive sun gear 30 → final drive planetary carrier 37;

[0083] Forward gear D3: Operate the shift mechanism to engage the synchronizer 45 with the main speed gear III driven gear 13, the mechanical shift fork gear sleeve I 48 with the secondary shaft 43, the normal gear driven gear 24 with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 50 with the crawler gear driven gear 27. The transmission route at this time is: main speed gear III driving gear 8 → main speed gear III driven gear 13 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final drive sun gear 30 → final drive planetary carrier 37;

[0084] Forward gear D4: Operate the shift mechanism to engage the synchronizer 45 with the main speed gear IV driven gear 12, the mechanical shift fork gear sleeve I 48 with the secondary shaft 43, the normal gear driven gear 24 with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 50 with the crawler gear driven gear 27. The transmission route at this time is: main speed gear IV driving gear 7 → main speed gear IV driven gear 12 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0085] Forward gear D5: Operate the shift mechanism to engage the synchronizer 45 with the main speed V gear driving gear 10, the mechanical shift fork gear sleeve I 48 with the secondary shaft 43, the normal gear driven gear 24 with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 50 with the crawler gear driven gear 27. The transmission route at this time is: main speed V gear driving gear 10 → main speed V gear driven gear 15 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final drive sun gear 30 → final drive planetary carrier 37;

[0086] Forward gear D6: Operate the shift mechanism to engage the synchronizer 45 with the main speed VI gear driving gear 9, the mechanical shift fork gear sleeve I 48 with the secondary shaft 43, the normal gear driven gear 24 with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 50 with the crawler gear driven gear 27. The transmission route at this time is: main speed VI gear driving gear 9 → main speed VI gear driven gear 14 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final drive sun gear 30 → final drive planetary carrier 37;

[0087] 3. Reverse gear / direct gear:

[0088] Reverse gear A1: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 45 mesh with the main speed I gear driven gear 11, the mechanical shift fork gear sleeve I 48 mesh with the auxiliary speed D gear driven gear 16, the mechanical shift fork gear sleeve II 49 mesh with the auxiliary speed A gear driven gear 23, and the transmission route at this time is: the shuttle gear reversing driving gear 1 → Shuttle gear reversing driven gear 4 → Main speed II gear driven gear 5 → Main speed II gear driving gear 2 → Main speed I gear driving gear 6 → Main speed I gear driven gear 11 → Auxiliary speed D gear driven gear 16 → Auxiliary speed D gear driving gear 17 → Auxiliary speed A gear driving gear 20 → Auxiliary speed A gear driven gear 23 → Central transmission small bevel gear 28 → Central transmission large bevel gear 29 → Final transmission sun gear 30 → Final transmission planetary carrier 37;

[0089] Reverse gear A2: Operate the shift mechanism to mesh the shuttle gear reversing driving gear 1 with the shuttle gear reversing driven gear 4, the mechanical shift fork gear sleeve I 48 with the auxiliary speed D gear driven gear 16, and the mechanical shift fork gear sleeve II 49 with the auxiliary speed A gear driven gear 23. The transmission route at this time is: shuttle gear reversing driving gear 1 → shuttle gear reversing driven gear 4 → auxiliary speed D gear driven gear 16 → auxiliary speed D gear driving gear 17 → auxiliary speed A gear driving gear 20 → auxiliary speed A gear driven gear 23 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0090] Reverse gear A3: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 45 mesh with the main speed III gear driven gear 13, the mechanical shift fork gear sleeve I 48 mesh with the auxiliary speed D gear driven gear 16, the mechanical shift fork gear sleeve II 49 mesh with the auxiliary speed A gear driven gear 23, and the transmission route at this time is: the shuttle gear reversing driving gear 1 → Shuttle gear reversing driven gear 4 → Main speed II gear driven gear 5 → Main speed II gear driving gear 2 → Main speed III gear driving gear 8 → Main speed III gear driven gear 13 → Auxiliary speed D gear driven gear 16 → Auxiliary speed D gear driving gear 17 → Auxiliary speed A gear driving gear 20 → Auxiliary speed A gear driven gear 23 → Central transmission small bevel gear 28 → Central transmission large bevel gear 29 → Final transmission sun gear 30 → Final transmission planetary carrier 37;

[0091] Reverse gear A4: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 45 mesh with the main speed IV gear driven gear 12, the mechanical shift fork gear sleeve I 48 mesh with the auxiliary speed D gear driven gear 16, the mechanical shift fork gear sleeve II 49 mesh with the auxiliary speed A gear driven gear 23, and the transmission route at this time is: the shuttle gear reversing driving gear 1 → Shuttle gear reversing driven gear 4 → Main speed II gear driven gear 5 → Main speed II gear driving gear 2 → Main speed IV gear driving gear 7 → Main speed IV gear driven gear 12 → Auxiliary speed D gear driven gear 16 → Auxiliary speed D gear driving gear 17 → Auxiliary speed A gear driving gear 20 → Auxiliary speed A gear driven gear 23 → Central transmission small bevel gear 28 → Central transmission large bevel gear 29 → Final transmission sun gear 30 → Final transmission planetary carrier 37;

[0092] Reverse gear A5: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 45 mesh with the main speed V gear driving gear 10, the mechanical shift fork gear sleeve I 48 mesh with the auxiliary speed D gear driven gear 16, the mechanical shift fork gear sleeve II 49 mesh with the auxiliary speed A gear driven gear 23, and the transmission route at this time is: the shuttle gear reversing driving gear 1 → Shuttle gear reversing driven gear 4 → Main speed II gear driven gear 5 → Main speed II gear driving gear 2 → Main speed V gear driving gear 10 → Main speed V gear driven gear 15 → Auxiliary speed D gear driven gear 16 → Auxiliary speed D gear driving gear 17 → Auxiliary speed A gear driving gear 20 → Auxiliary speed A gear driven gear 23 → Central transmission small bevel gear 28 → Central transmission large bevel gear 29 → Final transmission sun gear 30 → Final transmission planetary carrier 37;

[0093] Reverse gear A6: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 45 mesh with the main speed VI gear driven gear 14, the mechanical shift fork gear sleeve I 48 mesh with the auxiliary speed D gear driven gear 16, the mechanical shift fork gear sleeve II 49 mesh with the auxiliary speed A gear driven gear 23, and the transmission route at this time is: the shuttle gear reversing driving gear 1 → Shuttle gear reversing driven gear 4 → Main speed II gear driven gear 5 → Main speed II gear driving gear 2 → Main speed VI gear driving gear 9 → Main speed VI gear driven gear 14 → Auxiliary speed D gear driven gear 16 → Auxiliary speed D gear driving gear 17 → Auxiliary speed A gear driving gear 20 → Auxiliary speed A gear driven gear 23 → Central transmission small bevel gear 28 → Central transmission large bevel gear 29 → Final transmission sun gear 30 → Final transmission planetary carrier 37;

[0094] Reverse gear B1: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 45 mesh with the main speed I gear driven gear 11, the mechanical shift fork gear sleeve I 48 mesh with the auxiliary speed D gear driven gear 16, the mechanical shift fork gear sleeve II 49 mesh with the auxiliary speed B gear driven gear 22, and the transmission route at this time is: the shuttle gear reversing driving gear 1 → Shuttle gear reversing driven gear 4 → Main speed II gear driven gear 5 → Main speed II gear driving gear 2 → Main speed I gear driving gear 6 → Main speed I gear driven gear 11 → Auxiliary speed D gear driven gear 16 → Auxiliary speed D gear driving gear 17 → Auxiliary speed B gear driving gear 19 → Auxiliary speed B gear driven gear 22 → Central transmission small bevel gear 28 → Central transmission large bevel gear 29 → Final transmission sun gear 30 → Final transmission planetary carrier 37;

[0095] Reverse gear B2: Operate the shift mechanism to mesh the shuttle gear reversing driving gear 1 with the shuttle gear reversing driven gear 4, the mechanical shift fork gear sleeve I 48 with the auxiliary speed D gear driven gear 16, and the mechanical shift fork gear sleeve II 49 with the auxiliary speed B gear driven gear 22. The transmission route at this time is: shuttle gear reversing driving gear 1 → shuttle gear reversing driven gear 4 → auxiliary speed D gear driven gear 16 → auxiliary speed D gear driving gear 17 → auxiliary speed B gear driving gear 19 → auxiliary speed B gear driven gear 22 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0096] Reverse gear B3: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 45 mesh with the main speed III gear driven gear 13, the mechanical shift fork gear sleeve I 48 mesh with the auxiliary speed D gear driven gear 16, the mechanical shift fork gear sleeve II 49 mesh with the auxiliary speed B gear driven gear 22, and the transmission route at this time is: the shuttle gear reversing driving gear 1 → Shuttle gear reversing driven gear 4 → Main speed II gear driven gear 5 → Main speed II gear driving gear 2 → Main speed III gear driving gear 8 → Main speed III gear driven gear 13 → Auxiliary speed D gear driven gear 16 → Auxiliary speed D gear driving gear 17 → Auxiliary speed B gear driving gear 19 → Auxiliary speed B gear driven gear 22 → Central transmission small bevel gear 28 → Central transmission large bevel gear 29 → Final transmission sun gear 30 → Final transmission planetary carrier 37;

[0097] Reverse gear B4: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 45 mesh with the main speed IV gear driven gear 12, the mechanical shift fork gear sleeve I 48 mesh with the auxiliary speed D gear driven gear 16, the mechanical shift fork gear sleeve II 49 mesh with the auxiliary speed B gear driven gear 22, and the transmission route at this time is: the shuttle gear reversing driving gear 1 → Shuttle gear reversing driven gear 4 → Main speed II gear driven gear 5 → Main speed II gear driving gear 2 → Main speed IV gear driving gear 7 → Main speed IV gear driven gear 12 → Auxiliary speed D gear driven gear 16 → Auxiliary speed D gear driving gear 17 → Auxiliary speed B gear driving gear 19 → Auxiliary speed B gear driven gear 22 → Central transmission small bevel gear 28 → Central transmission large bevel gear 29 → Final transmission sun gear 30 → Final transmission planetary carrier 37;

[0098] Reverse gear B5: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 45 mesh with the main speed V gear driving gear 10, the mechanical shift fork gear sleeve I 48 mesh with the auxiliary speed D gear driven gear 16, the mechanical shift fork gear sleeve II 49 mesh with the auxiliary speed B gear driven gear 22, and the transmission route at this time is: shuttle gear reversing driving gear 1 → Shuttle gear reversing driven gear 4 → Main speed II gear driven gear 5 → Main speed II gear driving gear 2 → Main speed V gear driving gear 10 → Main speed V gear driven gear 15 → Auxiliary speed D gear driven gear 16 → Auxiliary speed D gear driving gear 17 → Auxiliary speed B gear driving gear 19 → Auxiliary speed B gear driven gear 22 → Central transmission small bevel gear 28 → Central transmission large bevel gear 29 → Final transmission sun gear 30 → Final transmission planetary carrier 37;

[0099] Reverse gear B6: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 45 mesh with the main speed VI gear driven gear 14, the mechanical shift fork gear sleeve I 48 mesh with the auxiliary speed D gear driven gear 16, the mechanical shift fork gear sleeve II 49 mesh with the auxiliary speed B gear driven gear 22, and the transmission route at this time is: shuttle gear reversing driving gear 1 → Shuttle gear reversing driven gear 4 → Main speed II gear driven gear 5 → Main speed II gear driving gear 2 → Main speed VI gear driving gear 9 → Main speed VI gear driven gear 14 → → Auxiliary speed D gear driven gear 16 → Auxiliary speed D gear driving gear 17 → Auxiliary speed B gear driving gear 19 → Auxiliary speed B gear driven gear 22 → Central transmission small bevel gear 28 → Central transmission large bevel gear 29 → Final transmission sun gear 30 → Final transmission planetary carrier 37;

[0100] Reverse gear C1: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 45 mesh with the main speed I gear driven gear 11, the mechanical shift fork gear sleeve I 48 mesh with the auxiliary speed D gear driven gear 16, and the mechanical shift fork gear sleeve I 48 mesh with the auxiliary speed C gear driven gear 21. The transmission route at this time is: the shuttle gear reversing driving gear 1 → Shuttle gear reversing driven gear 4 → Main speed II gear driven gear 5 → Main speed II gear driving gear 2 → Main speed I gear driving gear 6 → Main speed I gear driven gear 11 → Auxiliary speed D gear driven gear 16 → Auxiliary speed D gear driving gear 17 → Auxiliary speed C gear driving gear 18 → Auxiliary speed C gear driven gear 21 → Central transmission small bevel gear 28 → Central transmission large bevel gear 29 → Final transmission sun gear 30 → Final transmission planetary carrier 37;

[0101] Reverse gear C2: Operate the shift mechanism to mesh the shuttle gear reversing driving gear 1 with the shuttle gear reversing driven gear 4, the mechanical shift fork gear sleeve I 48 with the auxiliary speed D gear driven gear 16, and the mechanical shift fork gear sleeve I 48 with the auxiliary speed C gear driven gear 21. The transmission route at this time is: shuttle gear reversing driving gear 1 → shuttle gear reversing driven gear 4 → auxiliary speed D gear driven gear 16 → auxiliary speed D gear driving gear 17 → auxiliary speed C gear driving gear 18 → auxiliary speed C gear driven gear 21 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0102] Reverse gear C3: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 45 mesh with the main speed III gear driven gear 13, the mechanical shift fork gear sleeve I 48 mesh with the auxiliary speed D gear driven gear 16, and the mechanical shift fork gear sleeve I 48 mesh with the auxiliary speed C gear driven gear 21. The transmission route at this time is: the shuttle gear reversing driving gear 1 → Shuttle gear reversing driven gear 4 → Main speed II gear driven gear 5 → Main speed II gear driving gear 2 → Main speed III gear driving gear 8 → Main speed III gear driven gear 13 → Auxiliary speed D gear driven gear 16 → Auxiliary speed D gear driving gear 17 → Auxiliary speed C gear driving gear 18 → Auxiliary speed C gear driven gear 21 → Central transmission small bevel gear 28 → Central transmission large bevel gear 29 → Final transmission sun gear 30 → Final transmission planetary carrier 37;

[0103] Reverse gear C4: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 45 mesh with the main speed IV gear driven gear 12, the mechanical shift fork gear sleeve I 48 mesh with the auxiliary speed D gear driven gear 16, and the mechanical shift fork gear sleeve I 48 mesh with the auxiliary speed C gear driven gear 21. The transmission route at this time is: the shuttle gear reversing driving gear 1 → Shuttle gear reversing driven gear 4 → Main speed II gear driven gear 5 → Main speed II gear driving gear 2 → Main speed IV gear driving gear 7 → Main speed IV gear driven gear 12 → Auxiliary speed D gear driven gear 16 → Auxiliary speed D gear driving gear 17 → Auxiliary speed C gear driving gear 18 → Auxiliary speed C gear driven gear 21 → Central transmission small bevel gear 28 → Central transmission large bevel gear 29 → Final transmission sun gear 30 → Final transmission planetary carrier 37;

[0104] Reverse gear C5: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 45 mesh with the main speed V gear driving gear 10, the mechanical shift fork gear sleeve I 48 mesh with the auxiliary speed D gear driven gear 16, and the mechanical shift fork gear sleeve I 48 mesh with the auxiliary speed C gear driven gear 21. The transmission route at this time is: the shuttle gear reversing driving gear 1 → Shuttle gear reversing driven gear 4 → Main speed II gear driven gear 5 → Main speed II gear driving gear 2 → Main speed V gear driving gear 10 → Main speed V gear driven gear 15 → Auxiliary speed D gear driven gear 16 → Auxiliary speed D gear driving gear 17 → Auxiliary speed C gear driving gear 18 → Auxiliary speed C gear driven gear 21 → Central transmission small bevel gear 28 → Central transmission large bevel gear 29 → Final transmission sun gear 30 → Final transmission planetary carrier 37;

[0105] Reverse gear C6: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 45 mesh with the main speed VI gear driven gear 14, the mechanical shift fork gear sleeve I 48 mesh with the auxiliary speed D gear driven gear 16, and the mechanical shift fork gear sleeve I 48 mesh with the auxiliary speed C gear driven gear 21. The transmission route at this time is: the shuttle gear reversing driving gear 1 → Shuttle gear reversing driven gear 4 → Main speed II gear driven gear 5 → Main speed II gear driving gear 2 → Main speed VI gear driving gear 9 → Main speed VI gear driven gear 14 → Auxiliary speed D gear driven gear 16 → Auxiliary speed D gear driving gear 17 → Auxiliary speed C gear driving gear 18 → Auxiliary speed C gear driven gear 21 → Central transmission small bevel gear 28 → Central transmission large bevel gear 29 → Final transmission sun gear 30 → Final transmission planetary carrier 37;

[0106] Reverse gear D1: Operate the shift mechanism to mesh the shuttle gear reversing driving gear 1 with the shuttle gear reversing driven gear 4, mesh the main speed II gear driven gear 5 with the main speed II gear driving gear 2, mesh the synchronizer 45 with the main speed I gear driven gear 11, and mesh the mechanical shift fork gear sleeve I 48 and the mechanical shift fork gear sleeve II 49 with the secondary shaft 43. The transmission route at this time is: shuttle gear reversing driving gear 1 → shuttle gear reversing driven gear 4 → main speed II gear driven gear 5 → main speed II gear driving gear 2 → main speed I gear driving gear 6 → main speed I gear driven gear 11 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0107] Reverse gear D2: Operate the shift mechanism to mesh the shuttle gear reversing driving gear 1 with the shuttle gear reversing driven gear 4, the synchronizer 45 with the secondary shaft 43, and the mechanical shift fork gear sleeve I 48 and the mechanical shift fork gear sleeve II 49 with the secondary shaft 43. The transmission route at this time is: shuttle gear reversing driving gear 1 → shuttle gear reversing driven gear 4 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0108] Reverse gear D3: Operate the shift mechanism to mesh the shuttle gear reversing driving gear 1 with the shuttle gear reversing driven gear 4, mesh the main speed II gear driven gear 5 with the main speed II gear driving gear 2, and mesh the synchronizer 45 with the main speed III gear driven gear 13. The transmission route at this time is: shuttle gear reversing driving gear 1 → shuttle gear reversing driven gear 4 → main speed II gear driven gear 5 → main speed II gear driving gear 2 → main speed III gear driving gear 8 → main speed III gear driven gear 13 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0109] Reverse gear D4: Operate the shift mechanism to mesh the shuttle gear reversing driving gear 1 with the shuttle gear reversing driven gear 4, mesh the main speed II gear driven gear 5 with the main speed II gear driving gear 2, and mesh the synchronizer 45 with the main speed IV gear driven gear 12. The transmission route at this time is: shuttle gear reversing driving gear 1 → shuttle gear reversing driven gear 4 → main speed II gear driven gear 5 → main speed II gear driving gear 2 → main speed IV gear driving gear 7 → main speed IV gear driven gear 12 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0110] Reverse gear D5: Operate the shift mechanism to mesh the shuttle gear reversing driving gear 1 with the shuttle gear reversing driven gear 4, mesh the main speed II gear driven gear 5 with the main speed II gear driving gear 2, and mesh the synchronizer 45 with the main speed V gear driving gear 10. The transmission route at this time is: shuttle gear reversing driving gear 1 → shuttle gear reversing driven gear 4 → main speed II gear driven gear 5 → main speed II gear driving gear 2 → main speed V gear driving gear 10 → main speed V gear driven gear 15 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0111] Reverse gear D6: Operate the shift mechanism to engage the shuttle gear reversing driving gear 1 with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 with the main speed II gear driving gear 2, and the synchronizer 45 with the main speed VI gear driving gear 9. The transmission route at this time is: shuttle gear reversing driving gear 1 → shuttle gear reversing driven gear 4 → main speed II gear driven gear 5 → main speed II gear driving gear 2 → main speed VI gear driving gear 9 → main speed VI gear driven gear 14 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37.

[0112] 4. Reverse gear / crawling gear:

[0113] Reverse gear A1: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 45 mesh with the main speed I gear driven gear 11, the mechanical shift fork gear sleeve I 48 mesh with the auxiliary speed D gear driven gear 16, the mechanical shift fork gear sleeve II 49 mesh with the auxiliary speed A gear driven gear 23, the normal gear driven gear 24 meshes with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 50 meshes with the creeper gear driven gear 27. The transmission route at this time is: shuttle gear reversing driving gear Gear 1 → Shuttle gear reversing driven gear 4 → Main speed II gear driven gear 5 → Main speed II gear driving gear 2 → Main speed I gear driving gear 6 → Main speed I gear driven gear 11 → Auxiliary speed D gear driven gear 16 → Auxiliary speed D gear driving gear 17 → Auxiliary speed A gear driving gear 20 → Auxiliary speed A gear driven gear 23 → Normal gear driven gear 24 → Normal gear driving gear 25 → Creeper gear driving gear 26 → Creeper gear driven gear 27 → Central transmission small bevel gear 28 → Central transmission large bevel gear 29 → Final transmission sun gear 30 → Final transmission planetary carrier 37;

[0114] Reverse gear A2: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the mechanical shift fork gear sleeve I 48 mesh with the auxiliary speed D gear driven gear 16, the mechanical shift fork gear sleeve II 49 mesh with the auxiliary speed A gear driven gear 23, the normal gear driven gear 24 meshes with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 50 meshes with the creeper gear driven gear 27. The transmission route at this time is: shuttle gear reversing driving gear 1 Gear 1 → Shuttle gear reversing driven gear 4 → Auxiliary speed D gear driven gear 16 → Auxiliary speed D gear driving gear 17 → Auxiliary speed A gear driving gear 20 → Auxiliary speed A gear driven gear 23 → Normal gear driven gear 24 → Normal gear driving gear 25 → Crawler gear driving gear 26 → Crawler gear driven gear 27 → Central transmission small bevel gear 28 → Central transmission large bevel gear 29 → Final transmission sun gear 30 → Final transmission planetary carrier 37;

[0115] Reverse gear A3: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 45 mesh with the main speed III gear driven gear 13, the mechanical shift fork gear sleeve I 48 mesh with the auxiliary speed D gear driven gear 16, the mechanical shift fork gear sleeve II 49 mesh with the auxiliary speed A gear driven gear 23, the normal gear driven gear 24 meshes with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 50 meshes with the creeper gear driven gear 27. The transmission route at this time is: shuttle gear reversing driving gear Gear 1 → Shuttle gear reversing driven gear 4 → Main speed II gear driven gear 5 → Main speed II gear driving gear 2 → Main speed III gear driving gear 8 → Main speed III gear driven gear 13 → Auxiliary speed D gear driven gear 16 → Auxiliary speed D gear driving gear 17 → Auxiliary speed A gear driving gear 20 → Auxiliary speed A gear driven gear 23 → Normal gear driven gear 24 → Normal gear driving gear 25 → Creeper gear driving gear 26 → Creeper gear driven gear 27 → Central transmission small bevel gear 28 → Central transmission large bevel gear 29 → Final drive sun gear 30 → Final drive planetary carrier 37;

[0116] Reverse gear A4: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 45 mesh with the main speed IV gear driven gear 12, the mechanical shift fork gear sleeve I 48 mesh with the auxiliary speed D gear driven gear 16, the mechanical shift fork gear sleeve II 49 mesh with the auxiliary speed A gear driven gear 23, the normal gear driven gear 24 meshes with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 50 meshes with the creeper gear driven gear 27. The transmission route at this time is: shuttle gear reversing driving gear Gear 1 → Shuttle gear reversing driven gear 4 → Main speed II gear driven gear 5 → Main speed II gear driving gear 2 → Main speed IV gear driving gear 7 → Main speed IV gear driven gear 12 → Auxiliary speed D gear driven gear 16 → Auxiliary speed D gear driving gear 17 → Auxiliary speed A gear driving gear 20 → Auxiliary speed A gear driven gear 23 → Normal gear driven gear 24 → Normal gear driving gear 25 → Creeper gear driving gear 26 → Creeper gear driven gear 27 → Central transmission small bevel gear 28 → Central transmission large bevel gear 29 → Final transmission sun gear 30 → Final transmission planetary carrier 37;

[0117] Reverse gear A5: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 45 mesh with the main speed V gear driving gear 10, the mechanical shift fork gear sleeve I 48 meshes with the auxiliary speed D gear driven gear 16, the mechanical shift fork gear sleeve II 49 meshes with the auxiliary speed A gear driven gear 23, the normal gear driven gear 24 meshes with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 50 meshes with the creeper gear driven gear 27. The transmission route at this time is: the shuttle gear reversing driving gear Gear 1 → Shuttle gear reversing driven gear 4 → Main speed II gear driven gear 5 → Main speed II gear driving gear 2 → Main speed V gear driving gear 10 → Main speed V gear driven gear 15 → Auxiliary speed D gear driven gear 16 → Auxiliary speed D gear driving gear 17 → Auxiliary speed A gear driving gear 20 → Auxiliary speed A gear driven gear 23 → Normal gear driven gear 24 → Normal gear driving gear 25 → Creeper gear driving gear 26 → Creeper gear driven gear 27 → Central transmission small bevel gear 28 → Central transmission large bevel gear 29 → Final transmission sun gear 30 → Final transmission planetary carrier 37;

[0118] Reverse gear A6: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 45 mesh with the main speed VI gear driven gear 14, the mechanical shift fork gear sleeve I 48 mesh with the auxiliary speed D gear driven gear 16, the mechanical shift fork gear sleeve II 49 mesh with the auxiliary speed A gear driven gear 23, the normal gear driven gear 24 meshes with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 50 meshes with the creeper gear driven gear 27. The transmission route at this time is: shuttle gear reversing driving gear Gear 1 → Shuttle gear reversing driven gear 4 → Main speed II gear driven gear 5 → Main speed II gear driving gear 2 → Main speed VI gear driving gear 9 → Main speed VI gear driven gear 14 → Auxiliary speed D gear driven gear 16 → Auxiliary speed D gear driving gear 17 → Auxiliary speed A gear driving gear 20 → Auxiliary speed A gear driven gear 23 → Normal gear driven gear 24 → Normal gear driving gear 25 → Creeper gear driving gear 26 → Creeper gear driven gear 27 → Central transmission small bevel gear 28 → Central transmission large bevel gear 29 → Final transmission sun gear 30 → Final transmission planetary carrier 37;

[0119] Reverse gear B1: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 45 mesh with the main speed I gear driven gear 11, the mechanical shift fork gear sleeve I 48 mesh with the auxiliary speed D gear driven gear 16, the mechanical shift fork gear sleeve II 49 mesh with the auxiliary speed B gear driven gear 22, the normal gear driven gear 24 meshes with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 50 meshes with the creeper gear driven gear 27. The transmission route at this time is: shuttle gear reversing driving gear Gear 1 → Shuttle gear reversing driven gear 4 → Main speed II gear driven gear 5 → Main speed II gear driving gear 2 → Main speed I gear driving gear 6 → Main speed I gear driven gear 11 → Auxiliary speed D gear driven gear 16 → Auxiliary speed D gear driving gear 17 → Auxiliary speed B gear driving gear 19 → Auxiliary speed B gear driven gear 22 → Normal gear driven gear 24 → Normal gear driving gear 25 → Creeper gear driving gear 26 → Creeper gear driven gear 27 → Central transmission small bevel gear 28 → Central transmission large bevel gear 29 → Final transmission sun gear 30 → Final transmission planetary carrier 37;

[0120] Reverse gear B2: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the mechanical shift fork gear sleeve I 48 mesh with the auxiliary speed D gear driven gear 16, the mechanical shift fork gear sleeve II 49 mesh with the auxiliary speed B gear driven gear 22, the normal gear driven gear 24 meshes with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 50 meshes with the creeper gear driven gear 27. The transmission route at this time is: shuttle gear reversing driving gear 1 Gear 1 → Shuttle gear reversing driven gear 4 → Auxiliary speed D gear driven gear 16 → Auxiliary speed D gear driving gear 17 → Auxiliary speed A gear driving gear 20 → Auxiliary speed A gear driven gear 23 → Central transmission small bevel gear 28 → Normal gear driven gear 24 → Normal gear driving gear 25 → Creeper gear driving gear 26 → Creeper gear driven gear 27 → Central transmission large bevel gear 29 → Final drive sun gear 30 → Final drive planetary carrier 37;

[0121] Reverse gear B3: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 45 mesh with the main speed III gear driven gear 13, the mechanical shift fork gear sleeve I 48 mesh with the auxiliary speed D gear driven gear 16, the mechanical shift fork gear sleeve II 49 mesh with the auxiliary speed B gear driven gear 22, the normal gear driven gear 24 meshes with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 50 meshes with the creeper gear driven gear 27. The transmission route at this time is: shuttle gear reversing driving gear Gear 1 → Shuttle gear reversing driven gear 4 → Main speed II gear driven gear 5 → Main speed II gear driving gear 2 → Main speed III gear driving gear 8 → Main speed III gear driven gear 13 → Auxiliary speed D gear driven gear 16 → Auxiliary speed D gear driving gear 17 → Auxiliary speed B gear driving gear 19 → Auxiliary speed B gear driven gear 22 → Normal gear driven gear 24 → Normal gear driving gear 25 → Creeper gear driving gear 26 → Creeper gear driven gear 27 → Central transmission small bevel gear 28 → Central transmission large bevel gear 29 → Final transmission sun gear 30 → Final transmission planetary carrier 37;

[0122] Reverse gear B4: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 45 mesh with the main speed IV gear driven gear 12, the mechanical shift fork gear sleeve I 48 mesh with the auxiliary speed D gear driven gear 16, the mechanical shift fork gear sleeve II 49 mesh with the auxiliary speed B gear driven gear 22, the normal gear driven gear 24 meshes with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 50 meshes with the creeper gear driven gear 27. The transmission route at this time is: shuttle gear reversing driving gear Gear 1 → Shuttle gear reversing driven gear 4 → Main speed II gear driven gear 5 → Main speed II gear driving gear 2 → Main speed IV gear driving gear 7 → Main speed IV gear driven gear 12 → Auxiliary speed D gear driven gear 16 → Auxiliary speed D gear driving gear 17 → Auxiliary speed B gear driving gear 19 → Auxiliary speed B gear driven gear 22 → Normal gear driven gear 24 → Normal gear driving gear 25 → Creeper gear driving gear 26 → Creeper gear driven gear 27 → Central transmission small bevel gear 28 → Central transmission large bevel gear 29 → Final transmission sun gear 30 → Final transmission planetary carrier 37;

[0123] Reverse gear B5: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 45 mesh with the main speed V gear driving gear 10, the mechanical shift fork gear sleeve I 48 meshes with the auxiliary speed D gear driven gear 16, the mechanical shift fork gear sleeve II 49 meshes with the auxiliary speed B gear driven gear 22, the normal gear driven gear 24 meshes with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 50 meshes with the creeper gear driven gear 27. The transmission route at this time is: the shuttle gear reversing driving gear Gear 1 → Shuttle gear reversing driven gear 4 → Main speed II gear driven gear 5 → Main speed II gear driving gear 2 → Main speed V gear driving gear 10 → Main speed V gear driven gear 15 → Auxiliary speed D gear driven gear 16 → Auxiliary speed D gear driving gear 17 → Auxiliary speed B gear driving gear 19 → Auxiliary speed B gear driven gear 22 → Normal gear driven gear 24 → Normal gear driving gear 25 → Creeper gear driving gear 26 → Creeper gear driven gear 27 → Central transmission small bevel gear 28 → Central transmission large bevel gear 29 → Final transmission sun gear 30 → Final transmission planetary carrier 37;

[0124] Reverse gear B6: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 45 mesh with the main speed VI gear driven gear 14, the mechanical shift fork gear sleeve I 48 mesh with the auxiliary speed D gear driven gear 16, the mechanical shift fork gear sleeve II 49 mesh with the auxiliary speed B gear driven gear 22, the normal gear driven gear 24 meshes with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 50 meshes with the creeper gear driven gear 27. The transmission route at this time is: the shuttle gear reversing driving gear Gear 1 → Shuttle gear reversing driven gear 4 → Main speed II gear driven gear 5 → Main speed II gear driving gear 2 → Main speed VI gear driving gear 9 → Main speed VI gear driven gear 14 → Auxiliary speed D gear driven gear 16 → Auxiliary speed D gear driving gear 17 → Auxiliary speed B gear driving gear 19 → Auxiliary speed B gear driven gear 22 → Normal gear driven gear 24 → Normal gear driving gear 25 → Creeper gear driving gear 26 → Creeper gear driven gear 27 → Central transmission small bevel gear 28 → Central transmission large bevel gear 29 → Final transmission sun gear 30 → Final transmission planetary carrier 37;

[0125] Reverse gear C1: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 45 mesh with the main speed I gear driven gear 11, the mechanical shift fork gear sleeve I 48 mesh with the auxiliary speed D gear driven gear 16, the mechanical shift fork gear sleeve I 48 mesh with the auxiliary speed C gear driven gear 21, the normal gear driven gear 24 meshes with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 50 meshes with the creeper gear driven gear 27. The transmission route at this time is: shuttle gear reversing driving gear Gear 1 → Shuttle gear reversing driven gear 4 → Main speed II gear driven gear 5 → Main speed II gear driving gear 2 → Main speed I gear driving gear 6 → Main speed I gear driven gear 11 → Auxiliary speed D gear driven gear 16 → Auxiliary speed D gear driving gear 17 → Auxiliary speed C gear driving gear 18 → Auxiliary speed C gear driven gear 21 → Normal gear driven gear 24 → Normal gear driving gear 25 → Creeper gear driving gear 26 → Creeper gear driven gear 27 → Central transmission small bevel gear 28 → Central transmission large bevel gear 29 → Final transmission sun gear 30 → Final transmission planetary carrier 37;

[0126] Reverse gear C2: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the mechanical shift fork gear sleeve I 48 mesh with the auxiliary speed D gear driven gear 16, the mechanical shift fork gear sleeve I 48 mesh with the auxiliary speed C gear driven gear 21, the normal gear driven gear 24 meshes with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 50 meshes with the creeper gear driven gear 27. The transmission route at this time is: shuttle gear reversing driving gear 1 Gear 1 → Shuttle gear reversing driven gear 4 → Auxiliary speed D gear driven gear 16 → Auxiliary speed D gear driving gear 17 → Auxiliary speed C gear driving gear 18 → Auxiliary speed C gear driven gear 21 → Normal gear driven gear 24 → Normal gear driving gear 25 → Creeper gear driving gear 26 → Creeper gear driven gear 27 → Central transmission small bevel gear 28 → Central transmission large bevel gear 29 → Final transmission sun gear 30 → Final transmission planetary carrier 37;

[0127] Reverse gear C3: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 45 mesh with the main speed III gear driven gear 13, the mechanical shift fork gear sleeve I 48 mesh with the auxiliary speed D gear driven gear 16, the mechanical shift fork gear sleeve I 48 mesh with the auxiliary speed C gear driven gear 21, the normal gear driven gear 24 meshes with the normal gear driving gear 25, the mechanical shift fork gear sleeve III 50 meshes with the creeper gear driven gear 27. The transmission route at this time is: shuttle gear reversing driving gear Gear 1 → Shuttle gear reversing driven gear 4 → Main speed II gear driven gear 5 → Main speed II gear driving gear 2 → Main speed III gear driving gear 8 → Main speed III gear driven gear 13 → Auxiliary speed D gear driven gear 16 → Auxiliary speed D gear driving gear 17 → Auxiliary speed C gear driving gear 18 → Auxiliary speed C gear driven gear 21 → Normal gear driven gear 24 → Normal gear driving gear 25 → Creeper gear driving gear 26 → Creeper gear driven gear 27 → Central transmission small bevel gear 28 → Central transmission large bevel gear 29 → Final transmission sun gear 30 → Final transmission planetary carrier 37;

[0128] Reverse gear C4: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 45 mesh with the main speed IV gear driven gear 12, the mechanical shift fork gear sleeve I 48 mesh with the auxiliary speed D gear driven gear 16, the mechanical shift fork gear sleeve I 48 mesh with the auxiliary speed C gear driven gear 21, the normal gear driven gear 24 meshes with the normal gear driving gear 25, the mechanical shift fork gear sleeve III 50 meshes with the creeper gear driven gear 27. The transmission route at this time is: shuttle gear reversing driving gear Gear 1 → Shuttle gear reversing driven gear 4 → Main speed II gear driven gear 5 → Main speed II gear driving gear 2 → Main speed IV gear driving gear 7 → Main speed IV gear driven gear 12 → Auxiliary speed D gear driven gear 16 → Auxiliary speed D gear driving gear 17 → Auxiliary speed C gear driving gear 18 → Auxiliary speed C gear driven gear 21 → Normal gear driven gear 24 → Normal gear driving gear 25 → Creeper gear driving gear 26 → Creeper gear driven gear 27 → Central transmission small bevel gear 28 → Central transmission large bevel gear 29 → Final transmission sun gear 30 → Final transmission planetary carrier 37;

[0129] Reverse gear C5: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 45 mesh with the main speed V gear driving gear 10, the mechanical shift fork gear sleeve I 48 mesh with the auxiliary speed D gear driven gear 16, the mechanical shift fork gear sleeve I 48 mesh with the auxiliary speed C gear driven gear 21, the normal gear driven gear 24 meshes with the normal gear driving gear 25, the mechanical shift fork gear sleeve III 50 meshes with the creeper gear driven gear 27. The transmission route at this time is: the shuttle gear reversing driving gear Gear 1 → Shuttle gear reversing driven gear 4 → Main speed II gear driven gear 5 → Main speed II gear driving gear 2 → Main speed V gear driving gear 10 → Main speed V gear driven gear 15 → Auxiliary speed D gear driven gear 16 → Auxiliary speed D gear driving gear 17 → Auxiliary speed C gear driving gear 18 → Auxiliary speed C gear driven gear 21 → Normal gear driven gear 24 → Normal gear driving gear 25 → Creeper gear driving gear 26 → Creeper gear driven gear 27 → Central transmission small bevel gear 28 → Central transmission large bevel gear 29 → Final transmission sun gear 30 → Final transmission planetary carrier 37;

[0130] Reverse gear C6: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 45 mesh with the main speed VI gear driven gear 14, the mechanical shift fork gear sleeve I 48 mesh with the auxiliary speed D gear driven gear 16, the mechanical shift fork gear sleeve I 48 mesh with the auxiliary speed C gear driven gear 21, the normal gear driven gear 24 meshes with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 50 meshes with the creeper gear driven gear 27. The transmission route at this time is: shuttle gear reversing driving gear Gear 1 → Shuttle gear reversing driven gear 4 → Main speed II gear driven gear 5 → Main speed II gear driving gear 2 → Main speed VI gear driving gear 9 → Main speed VI gear driven gear 14 → Auxiliary speed D gear driven gear 16 → Auxiliary speed D gear driving gear 17 → Auxiliary speed C gear driving gear 18 → Auxiliary speed C gear driven gear 21 → Normal gear driven gear 24 → Normal gear driving gear 25 → Creeper gear driving gear 26 → Creeper gear driven gear 27 → Central transmission small bevel gear 28 → Central transmission large bevel gear 29 → Final transmission sun gear 30 → Final transmission planetary carrier 37;

[0131] Reverse gear D1: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 45 mesh with the main speed I gear driven gear 11, the mechanical shift fork gear sleeve I 48, the mechanical shift fork gear sleeve II 49 mesh with the secondary shaft 43, the normal gear driven gear 24 meshes with the normal gear driving gear 25, the mechanical shift fork gear sleeve III 50 meshes with the creeper gear driven gear 27. The transmission route is: shuttle gear reversing driving gear 1 → shuttle gear reversing driven gear 4 → main speed gear II driven gear 5 → main speed gear II driving gear 2 → auxiliary speed gear D driven gear 16 → main speed gear I driven gear 11 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0132] Reverse gear D2: Operate the shift mechanism to mesh the shuttle gear reversing driving gear 1 with the shuttle gear reversing driven gear 4, the synchronizer 45 with the secondary shaft 43, the mechanical shift fork gear sleeve I 48 and the mechanical shift fork gear sleeve II 49 with the secondary shaft 43, the normal gear driven gear 24 with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 50 with the creeper gear driven gear 27. The transmission route at this time is: shuttle gear reversing driving gear 1 → shuttle gear reversing driven gear 4 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0133] Reverse gear D3: Operate the shift mechanism to mesh the shuttle gear reversing driving gear 1 with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 with the main speed II gear driving gear 2, the synchronizer 45 with the main speed III gear driven gear 13, the normal gear driven gear 24 with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 50 with the crawler gear driven gear 27. The transmission route at this time is: shuttle gear reversing driving gear 1 → shuttle gear reversing driven gear 4 → main speed II gear driven gear 5 → main speed II gear driving gear 2 → main speed III gear driving gear 8 → main speed III gear driven gear 13 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0134] Reverse gear D4: Operate the shift mechanism to mesh the shuttle gear reversing driving gear 1 with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 with the main speed II gear driving gear 2, the synchronizer 45 with the main speed IV gear driven gear 12, the normal gear driven gear 24 with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 50 with the creeper gear driven gear 27. The transmission route at this time is: shuttle gear reversing driving gear 1 → shuttle gear reversing driven gear 4 → main speed II gear driven gear 5 → main speed II gear driving gear 2 → main speed IV gear driving gear 7 → main speed IV gear driven gear 12 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0135] Reverse gear D5: Operate the shift mechanism to mesh the shuttle gear reversing driving gear 1 with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 with the main speed II gear driving gear 2, the synchronizer 45 with the main speed V gear driving gear 10, the normal gear driven gear 24 with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 50 with the crawler gear driven gear 27. The transmission route at this time is: shuttle gear reversing driving gear 1 → shuttle gear reversing driven gear 4 → main speed II gear driven gear 5 → main speed II gear driving gear 2 → main speed V gear driving gear 10 → main speed V gear driven gear 15 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final transmission sun gear 30 → final transmission planetary carrier 37;

[0136] Reverse gear D6: Operate the shift mechanism to engage the shuttle gear reversing driving gear 1 with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 with the main speed II gear driving gear 2, the synchronizer 45 with the main speed VI gear driving gear 9, the normal gear driven gear 24 with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 50 with the crawler gear driven gear 27. The transmission route at this time is: shuttle gear reversing driving gear 1 → shuttle gear reversing driven gear 4 → main speed II gear driven gear 5 → main speed II gear driving gear 2 → main speed VI gear driving gear 9 → main speed VI gear driven gear 14 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 28 → central transmission large bevel gear 29 → final drive sun gear 30 → final drive planetary carrier 37.

[0137] The simplified transmission route map is shown in the table below:

[0138]

[0139]

[0140]

[0141]

[0142] The shift control method of this scheme adopts wet clutch power reversing, wet clutch controls four-wheel drive, PTO power output wet clutch power switching, PTO high and low gears are mechanical shift fork sleeve shifting, interval working I-VI gears are synchronizer 45 shifting, and the rest are mechanical shift fork sleeve shifting.

Claims

1. A 48F+48R transmission mechanism, characterized in that: It includes, in sequence, a reversing assembly for adjusting the forward direction, a main transmission component for graded transmission, an auxiliary transmission component for adjusting the speed, a normal gear component for general use, a crawler gear component for crawling conditions, and a central transmission component for transmitting to the drive axle; The reversing assembly comprises an input shaft (41), a shuttle gear reversing idler wheel (3), a shuttle gear reversing driving gear (1), and a shuttle gear reversing driven gear (4); the shuttle gear reversing driving gear (1) is arranged on the input shaft (41); the main speed change component comprises a primary shaft (42) and a secondary shaft (43), and the central transmission assembly is connected to the secondary shaft (43) through a bevel gear set; the primary shaft (42) is coaxially arranged with the transmission shaft, and the secondary shaft (43) is arranged parallel to the primary shaft (42); the primary shaft (42) is provided with a main speed I gear driving gear (6), A main speed II gear driving gear (2), a main speed III gear driving gear (8), a main speed IV gear driving gear (7), a main speed V gear driving gear (10), and a main speed VI gear driving gear (9); a shuttle gear reversing driven gear (4) is arranged at the end of a secondary shaft (43); and a main speed I gear driven gear (11), a main speed II gear driven gear (5), a main speed III gear driven gear (13), a main speed IV gear driven gear (12), a main speed V gear driven gear (15), and a main speed VI gear driven gear (14) are arranged on the secondary shaft (43) corresponding to the primary shaft (42); The auxiliary speed change assembly comprises an auxiliary speed change A gear driving gear (20), an auxiliary speed change B gear driving gear (19), an auxiliary speed change C gear driving gear (18) and an auxiliary speed change D gear driving gear (17) arranged on a primary shaft (42), and an auxiliary speed change A gear driven gear (23), an auxiliary speed change B gear driven gear (22), an auxiliary speed change C gear driven gear (21) and an auxiliary speed change D gear driven gear (16) correspondingly arranged on a secondary shaft (43); The common gear assembly comprises a common gear driving gear (25) arranged on a primary shaft (42) and a common gear driven gear (24) correspondingly arranged on a secondary shaft (43); The crawler gear assembly includes a crawler gear driving gear (26) arranged on a primary shaft (42) and a crawler gear driven gear (27) correspondingly arranged on a secondary shaft (43); Among them, a forward and reverse wet clutch (38) is provided between the shuttle gear reversing driving gear (1) and the speed gear I driven gear; a synchronizer (45) is provided between the speed gear I driven gear and the main speed gear II driven gear (5), between the main speed gear III driven gear (13) and the main speed gear IV driven gear (12), between the main speed gear V driving gear (10) and the main speed gear VI driving gear (9), between the auxiliary speed gear A driven gear (23) and the auxiliary speed gear B driven gear (22), between the auxiliary speed gear C driven gear (21) and the auxiliary speed gear D driven gear (16), and between the normal gear driven gear (24) and the crawling gear driven gear (27).

2. The 48F+48R transmission mechanism according to claim 1, characterized in that: On the primary shaft (42), a main speed II gear driving gear (2), a main speed I gear driving gear (6), a main speed IV gear driving gear (7), a main speed III gear driving gear (8), a main speed VI gear driving gear (9), and a main speed V gear driving gear (10) are sequentially arranged from the input end to the output end; on the secondary shaft (43), a main speed II gear driven gear (5), a main speed I gear driven gear (11), a main speed IV gear driven gear (12), a main speed III gear driven gear (13), a main speed VI gear driven gear (14), and a main speed V gear driven gear (15) are sequentially arranged from the input end to the output end.

3. The 48F+48R transmission mechanism according to claim 1, characterized in that: The central transmission assembly comprises a rear axle transmission shaft (44), a brake (47), a differential (46), a bevel gear set for connecting the rear axle transmission shaft (44) and the secondary shaft (43), and a planetary gear set for connecting the rear axle. The brake (47) and the differential (46) are arranged on the rear axle transmission shaft (44).

4. The 48F+48R transmission mechanism according to claim 3, characterized in that: The bevel gear set comprises a central transmission small bevel gear (28) and a central transmission large bevel gear (29), wherein the central transmission small bevel gear (28) is connected to a secondary shaft (43), and the central transmission large bevel gear (29) is connected to a rear axle transmission shaft (44).

5. The 48F+48R transmission mechanism according to claim 3, characterized in that: The planetary gear set comprises a final drive sun gear (30), a final drive planet carrier (37), a final drive planetary gear (31) and a final drive ring gear (32); the final drive sun gear (30) is connected to a rear axle drive shaft (44); the final drive planet carrier (37) is connected to the rear axle; and the final drive planetary gear (31) is mounted on the final drive planet carrier (37) and meshes with the final drive sun gear (30).

6. The 48F+48R transmission mechanism according to claim 1, characterized in that: The invention also includes a power take-off assembly, which includes a primary power take-off shaft and a power output wet clutch (40) for connecting with the primary shaft (42).

7. The 48F+48R transmission mechanism according to claim 6, characterized in that: The power take-off assembly also includes a secondary power take-off shaft, wherein the primary power take-off shaft is provided with a PTO driving gear I (33) and a PTO driving gear II (34), and the secondary power take-off shaft is correspondingly provided with a PT0 driven gear I (35) and a PT0 driven gear II (36), and a synchronizer (45) is provided between the PT0 driven gear I (35) and the PT0 driven gear II (36).

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